This happened again to me today.  I was in a MSTeams chat session
(standalone app, not the web version) and opened a webpage in Firefox
that garbled the sound of the meeting in progress.  I noticed that when
it happened that in the system audio mixer/volume control manager, there
was suddenly a lot of entries for "speech-dispatcher" that previously
weren't there.  And this was also reflected in the list from the `ps`
command:

188672  0.0  0.0 450364  8304 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_espeak-ng 
/etc/speech-dispatcher/modules/espeak-ng.conf
188678  0.0  0.0 360052  5660 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_dummy 
/etc/speech-dispatcher/modules/dummy.conf
188681  0.0  0.0 360084  5972 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_generic 
/etc/speech-dispatcher/modules/mary-generic.conf
188684  0.0  0.0 360096  5492 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_generic 
/etc/speech-dispatcher/modules/espeak-generic.conf
188687  0.0  0.0 159724  2236 ?        Ssl  11:50   0:00 
/usr/bin/speech-dispatcher --spawn --communication-method unix_socket 
--socket-path /run/user/1000/speech-dispatcher/speechd.sock


Without touching the webpage or Firefox, I used the command-line to kill the 
one that looked to be the main speech-dispatcher process, which was the 188687 
process ID in this case (which also closed the other speech-dispatcher 
processes).  And immediately, the audio cleared up and I was able to continue 
browsing the webpage while the MSTeams meeting continued.

This makes me wonder if the problem is actually Firefox or if it's
speech-dispatcher -- or perhaps it's the data that Firefox is streaming
to speech-dispatcher??

Like the others in this thread, I have experimented with the speech
settings in Firefox to no avail.  If there's a magic setting to disable
it, I haven't found it.

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https://bugs.launchpad.net/bugs/1906741

Title:
  Firefox sometimes causes garbled audio

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